PURPOSE: To enable tracking without crosstalk to an arbitrary arrival polarized wave, by supplying a reference signal and an error signal led out from dextro- rotary/levo-rotary circular polarized wave components to a tracking receiver.

CONSTITUTION: An arrival radio wave is received by a radiator 11 and higher- order mode outputs TE01, TM01 are taken out by couplers 12, 13 while error signals VH, VE due to dextro-rotary/levo-rotary circular polarized wave components are taken out by a hybrid 15. The higher-order mode outputs are converted to orthogonal outputs EX, EY through 180°/90° phase shift type polarizers 16, 17, a polarization wave divider 20, low noise receivers 21, 23 and directional couplers 22, 24. The outputs EX, EY are converted through an orthogonal polarization wave divider 25, an 180° polarizer 26 and a polarization wave divider 27 while the converted outputs are synthesized by a hybrid 28 and the synthesized output is converted to a reference signal through an orthogonal polarization wave divider 29, phase shifters 30, 31, 35 and an orthogonal polarization wave divider 36 to be supplied to a tracking receiver along with the error signals.